CN104060025B - A kind of comprehensive furnace retaining method of essemer converter - Google Patents
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Abstract
The invention belongs to field of iron and steel smelting, especially relate to a kind of comprehensive furnace retaining method of essemer converter, the present invention selects light dolomite and unprocessed dolomite as spattering slag charge, with lime adding amount 1:1, and each 25-35kg/t.Cancel expensive and the calcined magnesite ball that waste residue amount is excessive and modification agent, and adopt slag making to support stove, slag splashing, stay slag pad stove three to carry out furnace retaining in conjunction with furnace retaining method.The present invention is on the basis of traditional slag splashing technique, the application conditions of suitable reduction Technology of Slag Splashingfor Furnace Maintenance, according to the actual production conditions of Ge Jia steel mill, to take to suit measures to local conditions, replace the method for displacement, meet slag splashing technique needs, given play to slag splashing effect to greatest extent, fully phase out artificial large shovel patch block fettling, mending material is near minimum, makes the cost efficiency of steel mill realize maximizing.Technique is improving and supplementing traditional slag splashing technique, making it have more popularization, being therefore benefited making the steel mill of more than China's nearly half.
Description
Technical field
The invention belongs to field of iron and steel smelting, especially relate to a kind of comprehensive furnace retaining method of essemer converter.
Background technology
The Technology of Slag Splashingfor Furnace Maintenance of converter originates from the U.S., within 1994, imports China into, there has been the developing history of 20 years so far, and the steel mill that China has more than nearly half at present have employed this technology, have received good effect.
The principle of technique; exactly by the nitrogen of jet in stove after tapping certain pressure, flow; recrement in stove is sprayed on furnace lining inwall, utilization of waste material, turns waste into wealth, protection backup lining brick; it is made not contact molten steel, slag; substantially not by the erosion of high temperature and slag, the slag that namely lower stove smelting process sprays at upper stove carries out, accomplishes: make steel on slag all the time; and do not make steel on brick, therefore the life-span of backup lining brick just substantially prolongs.Technique makes China about have steel mill's converter lining life of more than nearly half to obtain the growth of nearly ten times! Refractory consumption reduces greatly, and fettling material zero consumption has been accomplished by some steel mills, and production efficiency improves more than 20%, and the quality of this Technology application, plays the important and pivotal role to the cost efficiency of steel mill.
But, why technique has applied 20 years, China unexpectedly also have the steel mill (thousands of family) of nearly half not yet to adopt or result of use not good, its major cause is exactly, associated equipment condition (nitrogen operating pressure must be greater than 10 kilograms) required by technique, (slag charge must select expensive slag making magnesium ball and modification agent for raw material and final slag composition condition, magnesium oxide in final slag composition, calcium oxide, silicon-dioxide, Quan Tie, basicity has strict regulation), and temperature losses of the process condition is higher, and (tapping temperature is opened water and is greater than 1700 degree, connect water and be greater than 1680 degree), the production of many middle-size and small-size steel mills and equipment condition, also do not reach slag splashing this series of strict demand necessary, just slag splashing have to be abandoned, many employings with manually shoveling greatly " three meals in a day " patch block fettling maintain production, take a lot of work, time-consuming, take material, production efficiency is low.
Summary of the invention
The present invention mainly solves the technical problem existing for prior art; Provide and a kind of implement one and to put upside down steel, stop carbon-free tapping, realize in limited time reinforced (smelt and must add full slag charge before six minutes), preventing Molten Steel over-oxidation and injuring furnace lining.The resistance to material about 80% of fettling can be reduced, save more than steel technology 10--20kg/t, about 50 yuan/t steel saved by ton steel, a kind of comprehensive furnace retaining method of essemer converter of 100,000,000 yuan (producing the steel mill of about 2,000,000 tons per year) can be reduced costs the whole year.
The present invention also has an object to be solve the technical problem existing for prior art; Provide and a kind ofly reduce the volume of smoke and waste gas that produce when a large amount of resistance to material enters stove, the comprehensive furnace retaining method of environmental a kind of essemer converter up to standard.
The present invention has an object to be solve the technical problem existing for prior art again; Even if provide one to make up nitrogen negative impact that wretched insufficiency brings, by elaborate manipulation, real-time residue adjustment; slag can be made in the same old way, spatter; bring into play, slag blanket cemented, strong, fully play a kind of comprehensive furnace retaining method of essemer converter of protection backup lining brick effect.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of comprehensive furnace retaining method of essemer converter, is characterized in that, comprising:
The step of stove is supported in a slag making: the step of namely carrying out slag making in steelmaking process, start to throw in slag material to converter when specifically oxygen rifle starts pure oxygen blast to converter when making steel and carry out slag making, make in whole smelting process, progressively to generate the basic slag that basicity is 2.6-3.6, chemical reaction is there is not with the furnace lining of building by laying bricks or stones with basic refractory, slag material adopts lime and light dolomite compound, wherein, the add-on of lime is 30 ~ 65kg/t steel; The add-on of light dolomite is 15 ~ 45kg/t steel; Add in batches.During pure oxygen blast, the oxygen pressure of oxygen rifle is 0.65 ~ 0.8MPa; Oxygen supply intensity is 2.7 ~ 4.3 cubic meters per minute, ton, and pure oxygen blow duration is 10 ~ 14 minutes;
The step of a slag splashing; Namely after pure oxygen blast terminates, judge molten steel whether peroxidation before tapping when the thermometric of falling stove, according to molten steel, whether peroxidation proceeds as follows:
Operation one: if molten steel peroxidation, then add slag material immediately in converter, waits to throw in appropriate coke fines in the backward stove of tapping, then carries out nitrogen flushing with oxygen rifle to converter and spatter slag;
Operation two: if molten steel does not have peroxidation, then after thermometric terminates tapping, directly carrying out nitrogen flushing with oxygen rifle to converter spatters slag;
The slag material of described operation one and operation two is light dolomite, and the add-on of light dolomite is 5 ~ 10kg/t steel; During nitrogen flushing, the nitrogen pressure of oxygen rifle is 0.08 ~ 0.13MPa; Nitrogen offerings intensity is 3 ~ 5; The pure nitrogen flushing time is 3 ~ 5 minutes;
A step staying slag pad stove: i.e. furnace outage time after steel-making terminates, by retain in the step of slag splashing spatter the recrement after slag level up, spread out be attached to converter large face or little on, allow recrement cool gradually, the hollow place in size face is filled up, implement to repair.
In the comprehensive furnace retaining method of above-mentioned a kind of essemer converter, described slag making is supported in the step of stove, and when throwing in slag material to converter, need whole input within after pure oxygen blast starts six minutes complete, input mode is point two to three batches of inputs.
In the comprehensive furnace retaining method of above-mentioned a kind of essemer converter, adopt the once mode of falling stove when smelting, once the rate of falling stove needs to be greater than 70%.
In the comprehensive furnace retaining method of above-mentioned a kind of essemer converter, in the step of described slag splashing, when carrying out nitrogen flushing after operation one or operation two terminate, 30 ~ 40 second still loseed slag after blowing if open, the light dolomite that at once should add 5 ~ 10kg/t steel adjusts thickness slag.
In the comprehensive furnace retaining method of above-mentioned a kind of essemer converter, described slag making is supported in the step of stove, and the add-on of lime and light dolomite is all 25 ~ 45kg/t steel; And the mass ratio of the lime added and light dolomite is 1:1, unprocessed dolomite needs to add by 10-20kg/t steel according to smelting thermal equilibrium.
In the comprehensive furnace retaining method of above-mentioned a kind of essemer converter, in the step of described slag splashing, nitrogen flushing is spattered slag mode and is: body of heater is all divided into three parts, i.e. top furnace crown, middle part shaft and molten bath, bottom; When within first first minute, opening nitrogen blowing, oxygen lance position is at about 1.8 meters, and allow furnace temperature cool fast, furnace temperature is down to about 1000 degree simultaneously; After first minute terminates, rifle falls, rifle position is displaced downwardly to about 0.5 meter, and nitrogen flushing is after 1 ~ 1.5 minute, and oxygen rifle starts to slide up and down in 0.4 meter of-2 meters of interval, make finishing slag can from bottom to top, from top to down uniform spreading sticks to backup lining brick surface, what be formed with certain thickness and hardness spatters slag blanket.
Therefore, tool of the present invention has the following advantages: 1. choosing is to slag charge---light-burnedly replace calcined magnesite ball and modification agent with raw burn rhombspar, slag charge cost reduces by more than 50 than ever, calcined magnesite ball 700-800 yuan/t, modification agent 900-1000 yuan/t, light dolomite 280-300 yuan/t, unprocessed dolomite 40-60 yuan/t.When adopting calcined magnesite ball, lime+calcined magnesite ball+modification agent ton slag material is 105kg/t, unit consumption 46 yuan/t steel, lime+light dolomite+unprocessed dolomite, unit consumption 17 yuan/t steel, and contrast unit consumption saves 29 yuan/t steel.A medium-sized steel mill, 1 year can therefore cost-saving 5,800 ten thousand yuan by 2,000,000 tons/year of scales; 2. pass by smelting mostly be repeatedly fall stove put steel, be substantially all carbon-free tapping, the serious peroxidation of molten steel, very serious to the erosion of backup lining brick! Every class needs artificial large shovel patch block fettling, and " three meals in a day " are not altered under any circumstances, and consume a large amount of human and material resources, and cause converter inefficiency, and smelting cost remains high.Present enforcement one is put upside down steel, stops carbon-free tapping, realizes reinforced (smelts and must add full slag charge before six minutes) in limited time, slag charge is fully dissolved, changes saturating, prevent Molten Steel over-oxidation and injure furnace lining.Can save more than steel technology 10--20kg/t, about 50 yuan/t steel saved by ton steel, the whole year can reduce costs 100,000,000 yuan; 3. can completely abolish patch block fettling, monthly can save the fettling refractory materials of about 700 tons.About ton steel refractory consumption rate saves 10 yuan/t steel, 2,000 ten thousand yuan within 1 year, can be reduced costs.Meanwhile, because monthly the resistance to material saving of the fettling of hundreds of tons does not enter stove, avoid the volume of smoke and waste gas that produce when resistance to material enters stove, environmental up to standard; 4. adopt slag making to support stove, slag splashing, stay slag pad stove three in conjunction with furnace retaining method, the protecting method with splash slag more common than the past more has popularization, because slag method of spattering in the past requires higher to raw material, equipment and operational condition, difficulty is comparatively large, should not popularize.Such as: as long as past nitrogen operating pressure is lower than ten kilograms, just likely can not spatter slag, normally cannot complete and spatter slag operation process, not reach desirable slag splashing effect.But take now slag making, spatter slag, few slag, spread out slag, pad slag, stay slag,,, etc. series of measures, even if just greatly compensate for nitrogen negative impact that wretched insufficiency brings, slag can be made in the same old way, spatter, bring into play, slag blanket is cemented, strong, fully play protection backup lining brick effect; 5. unprocessed dolomite had both played the viscosity of magnesium oxide and slag system in working the slag, also played cooling agent effect simultaneously, regulated the thermal equilibrium in smelting process.Because its price is extremely cheap, it is the first-selection of spattering cost efficiency in slag process.
Accompanying drawing explanation
Fig. 1 is that ton steel fettling material consumes comparison diagram.
Cost declining of tackling key problems contrasted and schemed Tu2Shi steel mill and Nai Cai enterprise furnace life.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
(1) the present invention is mainly divided into three large parts:
One, stove is supported in slag making.
1, change slag charge, slag charge cost is lower---past converter spatter slag charge many employings calcined magnesite ball and modification agent, this kind of material is not only expensive, and effective constituent is limited, and waste residue material is large, and the ferric oxide taken away is many, and increase steel technology, loses more than gain! Present employing light dolomite and unprocessed dolomite do and spatter slag charge, and not only slag charge cost totally reduces half, cost-saving 26 yuan of ton steel.And the effective constituent in rhombspar accounts for more than 80%, waste residue amount only has the half of calcined magnesite ball, very favourable to reduction steel technology.Meanwhile, unprocessed dolomite also can take into account the function of refrigerant, and this measure is kill two birds with one stone.
2, precisely prepare burden, finishing slag index is more excellent---equal limy, calcined magnesite ball, modification agent and light dolomite in producer's slag charge that the past is general, only in this way, final slag composition just can be made up to standard: MgO 8-12%, CaO 45-60%, SiO216-19%, Fe2O313-16%, R=2.8-3.2, after saving now calcined magnesite ball and modification agent, by accurate batching, final slag composition requirement can be met equally, and the interval range of indices is less, more accurate, slag splashing better effects if.Make whole smelting process and finishing slag remain meta-alkalescence, chemical reaction does not occur with basic lining material, thus reach the effect that stove is supported in slag making, wherein, the add-on of lime is 30 ~ 65kg/t steel; The add-on of light dolomite is 15 ~ 45kg/t steel; In the present embodiment, the add-on of lime and light dolomite is all 30kg/t steel.During pure oxygen blast, the oxygen pressure of oxygen rifle is 0.65 ~ 0.8MPa; Oxygen supply intensity is 2.7 ~ 4.3; Pure oxygen blow duration is 10 ~ 14 minutes
3, few slag operation, steel technology is less---and in smelting process, iron and steel stock contained by slag charge is all about 18%, be wasted along with deslagging, iron and steel stock waste is fewer more at least for slag charge, past slag charge total amount is general all about 80-100kg/t steel, about total quantity of slag of lime+light dolomite only has 50-60kg/t steel, therefore steel technology saves more than 10--20kg/t steel now by improving batching! Only this item, general medium-sized steel mill just could reduce costs one hundred million!
4, one to put upside down steel, it is better that temperature control protects carbon---and past, most of steel mill taked repeatedly to fall stove, carbon-free tapping, and then the mode of additional carbon dust is smelted, because this smelting operation method is very easy.But the negative effect brought of this mode is very large, tap to tap time is long, tapping temperature is high, every consumption also high, lining erosion is serious! Take now one to put upside down steel method, and require one to fall rate to be greater than 70%, not only greatly shorten the heat, and tapping temperature is suitable for, end point carbon can remain on more than 0.08%, and every consumption obviously reduces, and especially smelting blow loss can reduce about 40%.
Two, slag splashing.
1, the real-time residue adjustment of process; appropriateness do thick do sticky---spatter slag effect quality; a key factor is, on the basis of finishing slag qualified, slag is done thickness; smelting process slag and finishing slag all must appropriateness do thick do sticky; qualified slag so just can be made by nitrogen flushing splash; be attached to furnace lining surface tightly, form a protective layer, play the effect of protection backup lining brick.The method of tune thickness slag is: 1. the lime of process slag and the ratio of rhombspar are that 1:1 enters stove, about being respectively about 25--35kg/t steel, along with the passing of furnace run, the basicity of slag and viscosity all can progressively strengthen, if because tap to tap time is long, or after-blow is serious, Molten Steel over-oxidation, just must add coke powder residue adjustment in the tapping process later stage in right amount; If 2. smelting endpoint finds that slag is rare, appropriate (3-5kg/t steel) rhombspar residue adjustment can be added; If 3. spatter slag to open to blow and still loseed slag in latter 30 seconds, at once should add 2-3kg/t steel rhombspar and adjust thickness slag; But finishing slag is feeding-up, sticky also can the increase of mistake is spattered slag resistance and spatter slag height, and slag effect is spattered in impact.So the real-time adjustment of finishing slag, must hold sense of propriety, thickness appropriateness, guarantee spatters slag amount and furnace retaining effect reaches optimum regime.
2, position height appropriateness is robbed, slag blanket uniform spreading---oxygen rifle upper and lower displacement operation when spattering slag is most important, within first minute, rob position suitably higher, cooling densification is played to slag, within second minute, then to fall rifle gradually and slide up and down, make finishing slag can from bottom to top, from top to down uniform spreading sticks to backup lining brick surface, what be formed with certain thickness and hardness spatters slag blanket, can resist live the high temperature of about 1700 degree and the erosion of slag, rob position lower, finishing slag bounce-back dynamics is larger, and slag blanket coverage rate is higher; On the contrary, rifle position is higher, then finishing slag bounce-back dynamics is more weak, and slag blanket coverage rate is lower.Spatter the determination of slag rifle position, to determine according to the particular case of the working of a furnace and needs, in a word, by conscientiously spattering slag, spattering slag, conscientiously having accomplished the smelting of next stove, " slag is made steel ", and not " brick is made steel ", high temperature do not contacted with backup lining brick with slag, do not react, thus greatly extend the work-ing life of backup lining brick.
3, within three minutes, be not altered under any circumstances, guarantee to spatter the slag time---slag splashing must have the corresponding time to ensure, the needs that the cooling multiviscosisty of finishing slag and chemical combination generate tricalcium silicate, Dicalcium Phosphate (Feed Grade) high temperature resistance, anti-slag lose material could be met, through repeatedly practising, be now defined as: spattering the slag time must not be less than three minutes! Otherwise do not have time enough, in slag, effective chemical reaction has been difficult to.So, in whole converter producing link, spatter slag be one essential, and very important production link, should accomplish: produce and hurry, spatter slag and do not forget, the time guarantees more than three minutes!
Specifically: body of heater is all divided into three parts, i.e. top furnace crown, middle part shaft and molten bath, bottom; When within first first minute, opening nitrogen blowing, oxygen lance position is at 1.8 meters, allows furnace temperature cool fast, near 1000 degree of furnace temperature simultaneously; After first minute terminates, rifle falls, rifle position is displaced downwardly to about 0.58 meter, and nitrogen flushing is after 1 ~ 1.5 minute, and oxygen rifle starts to slide up and down in 0.4 meter of-2 meters of interval, make finishing slag can from bottom to top, from top to down uniform spreading sticks to backup lining brick surface, what be formed with certain thickness and hardness spatters slag blanket.
4, grate dross is taked, outstanding " two sides " emphasis---spatter slag after three minutes, often have some recrement residual packings at furnace bottom, this part recrement is the qualified slag of chemical combination generation, if outwelled, is a waste greatly! If but directly added steel scrap, be easy to again wrap steel scrap, cause during smelting and be difficult to fusing, unfavorable to smelting, stove stove would leave recrement besides, is also easy to the furnace bottom that rises, and reduces heat size ratio, increases and smelts difficulty.Therefore, just need the mode this part recrement being taked size face, front and back grate dross, it is fully sticked to and is vulnerable to steel scrap and molten iron most and washes away with on the large face of converter corroded and little, this " two sides " is repaired with carrying out emphasis, consume whole recrements simultaneously, so just can receive the effect of getting twice the result with half the effort.
Three, slag pad stove is stayed.
1, find the opportune time accurately, stand slag correction of the defect---converter is in operation and all can runs into centre and guarantee replacement and to water time, or the overhaul of the equipments time, now furnace outage time is many more than half an hour, even nearly more than a few hours, this sight of all chances, must seize a favorable opportunity, by in advance specially retain spatter the recrement after slag level up, spread out be attached to converter large face or little on, allow recrement cool gradually, the hollow place in size face is filled up, implement to repair.This recrement stand is mended, cooled large face of converter and little, resistance to erosion, high temperature resistance, long service life.Than the better effects if of repairing size face with large fabric or self-flowing material!
2, remaining slag operation is implemented, recycle is spattered dry---and finishing slag generally contains full iron between 15-20%, if outside sludge-removing furnace, iron and steel stock contained in slag certainly will be slatterned, take remaining slag operation, full iron contained in slag is utilized at stove internal recycle and does not come out of the stove, steel technology just can be made greatly to reduce.Stay slag mode exactly recrement is all spattered dry till, accomplish to come out of the stove without slag.Accomplish this point, first, in smelting process when the thermometric of falling stove, sampling, deslagging, slag must be stayed appropriate, secondly, viscosity when spattering slag must be got hold of, finally, recrement is sticked to size face by grate dross mode and thoroughly spatter dry till.
3, prevent furnace bottom rising, switch if hold nitrogen oxygen---stay slag too much, and stove stove spatters dry again, will certainly occur that the phenomenon of furnace bottom rising occurs, can furnace inner space be reduced time serious, reduce heat size ratio, cause splash aggravation during smelting! Once there is this kind of situation, nitrogen oxygen switching mode just should be taked to solve, that is: before spattering slag and facing end, stop nitrogen, drive oxygen rifle about ten seconds, make the thickness slag dilution remaining in furnace bottom, then grate is outwelled, and stove stove moves in circles repeatedly, just can eliminate this hidden danger.
4, repair Furnace, minimum position of robbing is crucial---in smelting process, rob position if minimum and manipulate bad, oxygen rifle " eats " furnace bottom continually, is just easy to cause Furnace.Now in order to meet the decarburization needs of molten steel, just there will be oxygen rifle and more overtaking low, cause finally occurring potential safety hazard, serious threat normally is smelted! For this reason, must every class succeed before adhere to measuring converter liquid level, accomplish to know what's what, in smelting, strict implement is minimum robs a boundary, or, adopt electrical equipment nitrogen oxygen linkage mode, by minimum for oxygen blast rifle position mounting limit switch.Meanwhile, when spattering that slag is complete carries rifle to reinforced (light dolomite) 200-400 kilograms/stove pad furnace bottom of furnace bottom.
(2) be the specific examples adopting aforesaid method below.
(1), fettling material Expenditure Levels
Table 1: fettling material consumes contrast table
In table, data can be found out, after furnace life tackling key problem work, several stage refractory consumption is all on a declining curve, and the February reaches 1.977kg/ ton steel, it is introduced the best level reached over nearly 10 years.
(2) steel technology situation
As shown in Figure 1, steel technology directly affects the cost of iron and steel enterprise, also can reflect management and the operant level of an iron and steel enterprise simultaneously.To be tackled key problems work by furnace life, this experiment steel technology have decreased to 1072kg/t by 1094kg/t before; Average steel technology reduces 22kg/t.
(3) refractory materials and Economic Benefit Accounting
As shown in Figure 2, to be tackled key problems work by furnace life, Nai Cai enterprise achieves refractory consumption and reduces, all achieve very large benefit in smelting operation level, production efficiency, steel technology and slag charge consumption etc. simultaneously, there is statistic data for steel mill, only adjust steel mill's economic benefit with steel technology one at this.
Table 2, furnace life tackling key problem direct economic benefit contrast table
As can be seen from the above table, do not considering all the other slag charge consumption, under the prerequisite of the various factorss such as production efficiency raising, light steel technology one, can be iron and steel enterprise and to reduce costs more than 100,000,000 yuan/year.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (6)
1. the comprehensive furnace retaining method of essemer converter, is characterized in that, comprising:
The step of stove is supported in a slag making: the step of namely carrying out slag making in steelmaking process, start to throw in slag material to converter when specifically oxygen rifle starts pure oxygen blast to converter when making steel and carry out slag making, make in whole smelting process, progressively to generate the basic slag that basicity is 2.6-3.6, chemical reaction is there is not with the furnace lining of building by laying bricks or stones with basic refractory, slag material adopts lime and light dolomite compound, wherein, the add-on of lime is 30 ~ 65kg/t
steel; The add-on of light dolomite is 15 ~ 45kg/t
steel; During pure oxygen blast, the oxygen pressure of oxygen rifle is 0.65 ~ 0.8MPa; Oxygen supply intensity is 2.7 ~ 4.3 cubic metres/(minute ton) pure oxygen blow duration is 10 ~ 14 minutes;
The step of a slag splashing; Namely after pure oxygen blast terminates, judge molten steel whether peroxidation before tapping when the thermometric of falling stove, according to molten steel, whether peroxidation proceeds as follows:
Operation one: if molten steel peroxidation, then add slag material immediately in converter, with oxygen rifle, nitrogen flushing is carried out to converter after waiting to tap and spatter slag;
Operation two: if molten steel does not have peroxidation, then after thermometric terminates tapping, directly carrying out nitrogen flushing with oxygen rifle to converter spatters slag;
The slag material of described operation one and operation two is light dolomite, and the add-on of light dolomite is 5 ~ 10kg/t
steel; During nitrogen flushing, the nitrogen pressure of oxygen rifle is 0.08 ~ 0.13MPa; Nitrogen offerings intensity is 3 ~ 5m
3/ (mint); The pure nitrogen flushing time is 3 ~ 5 minutes;
A step staying slag pad stove: i.e. furnace outage time after steel-making terminates, by retain in the step of slag splashing spatter the recrement after slag level up, spread out be attached to converter large face or little on, allow recrement cool gradually, the hollow place in size face is filled up, implement to repair.
2. the comprehensive furnace retaining method of a kind of essemer converter according to claim 1, it is characterized in that, described slag making is supported in the step of stove, when throwing in slag material to converter, need whole input within six minutes after pure oxygen blast starts complete, input mode is point two to three batches of inputs.
3. the comprehensive furnace retaining method of a kind of essemer converter according to claim 1, is characterized in that, adopt the once mode of falling steel when tapping, once the rate of falling steel needs to be greater than 80%.
4. the comprehensive furnace retaining method of a kind of essemer converter according to claim 1, is characterized in that, in the step of described slag splashing, when carrying out nitrogen flushing after operation one or operation two terminate, within 30 ~ 40 seconds, has still loseed slag, at once should add 5 ~ 10kg/t if open after blowing
steellight dolomite adjust thickness slag.
5. the comprehensive furnace retaining method of a kind of essemer converter according to claim 1, it is characterized in that, described slag making is supported in the step of stove, and the add-on of lime and light dolomite is all 30 ~ 45kg/t
steel; And the mass ratio of the lime added and light dolomite is 1:1.
6. the comprehensive furnace retaining method of a kind of essemer converter according to claim 1, it is characterized in that, in the step of described slag splashing, in the step of described slag splashing, slag mode is spattered in nitrogen flushing: body of heater is all divided into three parts, i.e. top furnace crown, middle part shaft and molten bath, bottom; When within first first minute, opening nitrogen blowing, oxygen lance position is at 1.8 ± 0.1 meters, and allow furnace temperature cool fast, furnace temperature is down to 1000 ± 50 degree simultaneously; After first minute terminates, rifle falls, rifle position is displaced downwardly to about 0.58 ± 0.1 meter, nitrogen flushing is after 1 ~ 1.5 minute, oxygen rifle starts to slide up and down in 0.4 meter of-2 meters of interval, make finishing slag can from bottom to top, from top to down uniform spreading sticks to backup lining brick surface, what be formed with certain thickness and hardness spatters slag blanket.
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| CN109182643A (en) * | 2018-10-15 | 2019-01-11 | 马鞍山钢铁股份有限公司 | A kind of method of converter finishing slag repairing tapping face furnace lining |
| CN110157859A (en) * | 2019-04-18 | 2019-08-23 | 河钢股份有限公司承德分公司 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
| CN113930574B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Slag splashing fettling method beneficial to furnace bottom maintenance |
| CN112442566A (en) * | 2020-10-16 | 2021-03-05 | 广东韶钢松山股份有限公司 | Converter bottom protection method |
| CN114657309B (en) * | 2022-02-21 | 2023-04-18 | 阳春新钢铁有限责任公司 | Furnace protection method with low iron loss |
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| JPS63266015A (en) * | 1987-04-23 | 1988-11-02 | Nkk Corp | Method for repairing inner wall refractory in converter |
| CN102643947A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Method for shorting slag-splashing converter protection time of converter |
| CN102424886B (en) * | 2011-12-31 | 2013-03-27 | 钢铁研究总院 | Furnace protection process for decarburization converter less slag splashing |
| CN103194566A (en) * | 2013-03-30 | 2013-07-10 | 马钢(集团)控股有限公司 | Slag splashing protection method |
| CN103820596A (en) * | 2013-12-11 | 2014-05-28 | 攀钢集团成都钢钒有限公司 | Method for recycling high temperature steel residues of converter |
-
2014
- 2014-07-23 CN CN201410352332.6A patent/CN104060025B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63266015A (en) * | 1987-04-23 | 1988-11-02 | Nkk Corp | Method for repairing inner wall refractory in converter |
| CN102424886B (en) * | 2011-12-31 | 2013-03-27 | 钢铁研究总院 | Furnace protection process for decarburization converter less slag splashing |
| CN102643947A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Method for shorting slag-splashing converter protection time of converter |
| CN103194566A (en) * | 2013-03-30 | 2013-07-10 | 马钢(集团)控股有限公司 | Slag splashing protection method |
| CN103820596A (en) * | 2013-12-11 | 2014-05-28 | 攀钢集团成都钢钒有限公司 | Method for recycling high temperature steel residues of converter |
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| CN104060025A (en) | 2014-09-24 |
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